The curved part of a butt cheek directly below the vertical line of the butt crack and extending down to the leg. The part of the butt cheek that slaps together during a single twerk motion.

The line of my fingers was tangential to the curvature of her left chutlin.
Her shorts were too small forcing her chutlins to bulge out exposing themselves to us all at the PTA meeting.
Here chutlins were all pinked up from sitting in that plastic lawnchair for so long in her bikini.
Lets have a big round of chutlin claps for our next guest.

An extravagantly unintelligent person. Could alternatively be labeled as a "chav" or "buffoon". Typically unintelligent through willful ignorance. Stereotypically portrayed as someone with a forward-extended forehead and an overbite.

"Did you see that guy trying to drive his car through the park? What a chutlin!"